GeForce GT 340 vs Radeon RX 580

Intro

Compare those specifications to the Radeon RX 580, which comes with a core clock frequency of 1257 MHz and a GDDR5 memory frequency of 2000 MHz. It also features a 256-bit bus, and makes use of a 14 nm design. It is made up of 2304 SPUs, 144 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon RX 580		185 Watts
	Difference: 116 Watts (168%)

Memory Bandwidth

In theory, the Radeon RX 580 is 382% faster than the GeForce GT 340 overall, due to its greater data rate. (explain)

Radeon RX 580		262144 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 207744 (382%)

Texel Rate

The Radeon RX 580 will be a lot (about 928%) better at anisotropic filtering than the GeForce GT 340. (explain)

Radeon RX 580		181008 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 163408 (928%)

Pixel Rate

The Radeon RX 580 will be quite a bit (approximately 814%) faster with regards to FSAA than the GeForce GT 340, and able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 580		40224 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 35824 (814%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.